hg: shenandoah/jdk9/hotspot: Add and fix null-checks on barriers for Unsafe.put/get operations.

[roman at kennke.org]

Changeset: cd70d758123d
Author:    rkennke
Date:      2016-01-04 19:38 +0100
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/cd70d758123d

Add and fix null-checks on barriers for Unsafe.put/get operations.

! src/cpu/x86/vm/c1_LIRGenerator_x86.cpp
! src/share/vm/opto/library_call.cpp